The correct answer is 0.20 but I don't understand this question and would like to see the work to get to that answer :) thank you!

1. Two students are sliding a 225 kg sofa at constant speed across a wood floor; one student pulls with a force of 225 N at an angle of 13 degrees above the horizontal. The other student pushes with a force of 250 N at an angle of 23 degrees below the horizontal. What is the coefficient of kinetic friction between the sofa and the floor